i believe my speedometer is off because i put 3.00 gears to replace my 2.79 gear set.

here's what i know: here's what i want to know:
[ul][*]17 tooth Driven gear1. what drive gear i have[*]3.00 posi2. what driven gear would fix this problem[*]8" rear3. and even possibly, what tire and wheel diameter combo would help out.[*]c4 transmission[*]289 engine[*]1968 ford mustang[*]P205/70/R14 tires[/ul]

Thank you for your input.

 

please................................even the most basic of answers........................................... .don't just leave me hanging........................................... ...............at least let me know something, whether it be that you don't know or that you recommend me go somewhere......................................... ................thanks.

 

Pull the gear from the trans and see what color it is.
Do a search Im sure mustangs + has a tech link as to what the color is in relationship to how many teeth it has.
Look @ any trans builder site for gear calculators. Curries site comes to mind